Rotating steam boiler



Apnl 26, 1932. J. v. BLOMQUIST ET AL ROTATING STEAM BOILER Filed March19, 1931 W ll Patented Apr. 26, 1932 J'OHAN VIKTOR BLOMQUIST, OFSTOCKHOLM, SWEDEN, AND MARCEL' EI-ILINGEB,-OF

MULHOUSE, FRANCE, ASSIGNORS TO SWEDEN, A CORPORATION OF SWEDEN.AKTIEBOLAGET ATMOS, OF STOCKHOLM,

ROTATING STEAM BOILER Application filed March 19, 1931, Serial No.523,820, and in France July 7, 1930.

The present invention refers to improve ments in connection withrotating steam boilers of the type comprising a central containercommunicating with a plurality of tubes mounted around the former in asquirrel-cage like formation, and wherein separate tubes are providedfor admission of feed water to the steam generating tubes and fordelivery of the generated steam therefrom. Thereby the w, centralcontainer may also contribute to the steam generation, and may serve asa receiver for the steam generated within the tubes. During the rotationof the boiler, apart of the feed water entering the steam generat- A 1ing tubes is returned to the central container,

collection of sludge and the deposit of in crustations have especiallyarisen at the ends of the steam generating tubes remote from ac theadmission pipes for the feed water.

The invention has for its main object to eliminate the diflicultyreferred to in the foregoing by establishing a continuous flow of thefeed water in the same direction throughout This is 'per' the entirelength of. the tubes.

formed by introduction of the feed water into the tubes at one end ofthetubes only, the other end of the same being connected with the partlywater-filled central container, so that substantially no collection ofsludge can occur in the steam genera-ting tubes as the sludge togetherwith the amount of water returned from the tubes to the centralcontainer is conveyed to the latter, from which the sludge may be blownoif either continu ously or intermittently at suitable intervals.

The efiiciency of the invention may be further increased by thearrangement of scraper chains within the steam generating tubes suchchains effectively preventing the sludge from adhering to the interiorwalls of the tubes.

Another means adapted for still further improvement of the result is theprovision of an injector for increasing the rapidity of water flowthrough the steam generating tubes, this injector acting under influencefrom the fresh feed water forcibly fed in and serving to convey anadditional amount of water from the central container in circulationthough the steam generating tubes together with the fresh feed water.

In the following the invention is to be described by reference to theaccompanying drawing showing an embodiment thereof, the single figure inthe drawing representing a longitudinalsection of the boiler body. Forthe sake of convenience it is suitable to describe the invention byreference to its manthe said hollow pivotthe water, by means of thetubes 2, is conveyed to one end of the steam generating. tubes '3, whichare positioned around the central container 4' in a squirrel-cage likeformation previously known. At their opposite ends the tubes 3 areconnected with the central container 4 by means of return pipes 5, suchpipes extending within the tubes 3 substantially to the centre of thesame so as to form an overflow for preventing the tubes from beingentirely emptied during the rotation of the boiler.

At the operation of the boiler, the Water is displaced from the left tothe right in the drawing by means of the tubes 3, a part of the samebeing converted into the form of steam when passing the tubes 3, theremainder flowing further through the-return pipes 5 into the centralcontainer 4. The tubes 3 are interiorly provided with scraper chains 3which at the rotation will continually perform a scraping action againstthe inner face of the generating tubes so as to prevent any deposit ofimpurities on the tube walls, the impurities contained in the waterbeing then conveyed by the flow of the same into the central container.

In order to prevent a deposition of the impurities on the inner face ofthe container 4, such container is also provided with a scraper chain e.

The generated steam is delivered through a fixedly mounted pipe 6provided with an upwardly bent inner end positioned at a level above thesurface of the bulk of water within the container 4.

A draining pipe 7 having a clown-bent inner end is also provided Withinthe container 4 such pipe extending into the bottom portion of thecontainer, and by means of the same a certain amount of water may becontinually or periodically blown oif from the container, then conveyingthe impurities accelerate the flow of water through the generator, andespecially through its' generating tubes. by means for instance of aninjector, which consists of a tube 8 mounted coaxially around the steamdelivery tube 6 and acts for the sucking in of additional feed water tothe generating tubes 3 from the central container 4, such additionalfeed water forming a circulation feed water flow.

This injector means may for instance consist of a reduced or throttledportion 9 of the tubular feed water inlet pivot 1, in which the outletend of the pipe 8 is mounted. By the increased rapidity of flow of thefresh feed water when passing the throttled entrance portion 9, thewater from the centralcontainer will be sucked in by means of the pipe 8and added to the amount of fresh feed water introduced to the pipes 3.

From the foregoing it will thus be apparent that the rapidity, or amountof Water per unit of time, of the flow of circulation through the tubes3 and the central container 4 may be materially increased, and therebythe said tubes are effectively washed clean.

At intervals it may be desired entirely to empty the tubes 3, and forthis purpose the .pipes 5 are provided with a little bore 10 flow bacl:into the said container throughthe. said bores 10.

It will easily'be understood that it is advantageous to mount the steamgenerating tubes in a manner so as to permit the same a free expansionindependently of each other when acted upon by the heat. At their oneend the tubes 3 are rigidly connected with the return pipes 5 having asubstantial diam.-

eter, and for the aforesaid purpose the feed pipes 2 must therefore beshaped in a manner permitting an easy deformation. In the embodimentshown in the drawing, this may be arrived at by constructing the feedpipes 2 in the form of coils permitting the variation in length of thesteam generating tubes 3., forinstance as shown'in the drawing.

The steam boiler body according to the invention may be mounted so as torotate around a horizontal axis, or even the axis of rotation may takean inclining position.

IVhat we claim and desire to secure by Letters Patent is 1. In arotating steam boiler of the character described, a central container, aplurality of steam generating tubes positioned in a squirrel-cage likeformation around the same, means for the force-feed admission of freshfeed water at one end of the said steam generating tubes independentlyof the central container, means for connecting the opposite ends of thesaid tubes with the said container, and means for delivery of thegenerated steam from the latter.

2. In a rotating steam boiler of the character described, a centralcontainer, a plurality of steam generating tubes positioned in asquirrel-cage like formation around the 3. In arotating steam boiler ofthe char acter described, a central container, a plurality of steamgenerating tubes positioned in a squirrel-cage like formation around thesame, means for the force-feed admission of fresh feed water at one endof the said steam generating tubes, means for returning of additionalfeed water from the central container to the generating tubes at thesame end of the latter, means for connecting the opposite ends of thesaid tubes with the cen-;

tral container, and means for delivery of the generated steam from saidcontainer.

4. In a rotating steam boiler according to claim 3, the additionalfeature of a scraper means mounted in each of the steam generat-' T ingtubes and connected with the opposite ends of the same.

5. In a rotating steam boiler of the character described, a centralcontainer, a plural- .ity of steam generating tubes positioned in a,

squirrel-cage like formation around the same, means for the force-feedadmission of fresh feed water at one end of the said steam generatingtubes independently of the central container, injector means actuated bythe fresh feed water forcibly fed in and adapted for returning ofadditional feed water fro-m the central container to the generatingtubes at the same end of the latter, means for connecting the oppositeends of the said tubes with the central container, and means fordelivery of the generated steam from said container.

6. In a rotating steam boiler according to claim 5, the additionalfeatures of a scraper means in each of the steam generating tubes and inthe central container, and means for blowing off the sludge from thebottom portion of the latter.

7. In a rotating steam boiler of the character described, a centralcontainer, a plurality of steam generating tubes positioned in asquirrel-cage like formation around the same, an inlet for fresh feedWater to the.

tubes, a flexible pipe connection connecting each of the steamgenerating tubes at one end of the boiler With said feed water inletindependently of the central container, rigid tubular return pipeconnections between'the generating tubes and the central container atthe opposite end of the boiler, and means for delivery of thegeneratedsteam from the said container. v

8. In a rotating steam boiler according to claim 7, the additionalfeatures that the rigid return pipe connections are extended into thesteam generating tubes so as to form overflow outlets therefrom, andthat small sized outlet means are provided in the extended return pipeends in a position adjacent to the portion of the steam generating tubesnearest to the axis of rotation.

9. In a rotating steam boiler according to claim 7, the additionalfeatures of scraper means in each of the steam generating tubes and inthe central container, and means for blowing off the sludge from thebottom portion of the latter.

10. In a rotating steam boiler of the character described, a centralcontainer, a plurality of steam generating tubes positioned in asquirrel-cage like formation around the same, an inlet adapted for theforce-feed admission of fresh feed water to the tubes, aflexible pipeconnection connecting each of the steam generating tubes at one end ofthe boiler with said feed water inlet independently of the centralcontainer, rigid tubular return pipe connections between the generatingtubes and the central container at the opposite end of the boiler, suchreturn pipes being adapted to form over-fiow means Within the steamgenerating tubes, injector means actuated by the fresh feed Waterforcibly fed and in the central container, and means for blowing off thesludge from the bottom portion of the latter.

In testimony whereof we have signed our names to this specification.

J OHAN VIKTOR BLOMQUIST. MARGEL EHLINGER.

in d dapted for returning an additional

